scholarly journals Numerical modeling of quantum beam generation from ultra-intense laser-matter interactions

2015 ◽  
Vol 33 (2) ◽  
pp. 151-155 ◽  
Author(s):  
Tatsufumi Nakamura ◽  
Takehito Hayakawa
Keyword(s):  
Energy Transport ◽  
Laser Energy ◽  
Radiation Reaction ◽  
High Energy ◽  
Intense Laser ◽  
Incident Laser ◽  
Particle In Cell ◽  
Transport Code ◽  
Incident Laser Energy ◽  
Good Agreement

AbstractWhen intense laser beams interact with solid targets, high-energy photons are effectively generated via radiation reaction effect. These photons receive a large portion of the incident laser energy, and the energy transport by photons through the target is crucial for the understanding of the laser–matter interactions. In order to understand the energy transport, we newly developed a Particle-in-Cell code which includes the photon–matter interactions by introducing photon macro-particles. Test simulations are performed and compared with simulations using a particle transport code, which shows a good agreement.

scholarly journals Ultra-intense laser pulses in near-critical underdense plasmas – radiation reaction and energy partitioning

2017 ◽  
Vol 83 (2) ◽  
Author(s):  
Erik Wallin ◽  
Arkady Gonoskov ◽  
Christopher Harvey ◽  
Olle Lundh ◽  
Mattias Marklund
Keyword(s):  
Laser Pulse ◽  
Pulse Propagation ◽  
Laser Energy ◽  
Radiation Reaction ◽  
Laser Pulses ◽  
High Energy ◽  
Intense Laser ◽  
Long Distance ◽  
Weakly Nonlinear ◽  
Highly Nonlinear

Although, for current laser pulse energies, the weakly nonlinear regime of laser wakefield acceleration is known to be the optimal for reaching the highest possible electron energies, the capabilities of upcoming large laser systems will provide the possibility of running highly nonlinear regimes of laser pulse propagation in underdense or near-critical plasmas. Using an extended particle-in-cell (PIC) model that takes into account all the relevant physics, we show that such regimes can be implemented with external guiding for a relatively long distance of propagation and allow for the stable transformation of laser energy into other types of energy, including the kinetic energy of a large number of high energy electrons and their incoherent emission of photons. This is despite the fact that the high intensity of the laser pulse triggers a number of new mechanisms of energy depletion, which we investigate systematically.

scholarly journals Incorporation of the Fragmentation Process into High Energy Transport Code (HETC)

1998 ◽  
Vol 35 (2) ◽  
pp. 87-92 ◽  
Author(s):  
Nobuhiro SHIGYO ◽  
Kenji ISHIBASHI ◽  
Kiminori IGA ◽  
Hirohiko KITSUKI ◽  
Hidehiko ARIMA
Keyword(s):  
Energy Transport ◽  
High Energy ◽  
Fragmentation Process ◽  
Transport Code

scholarly journals High-resolution sampling of beam-driven plasma wakefields

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Schröder ◽  
C. A. Lindstrøm ◽  
S. Bohlen ◽  
G. Boyle ◽  
R. D’Arcy ◽  
...  
Keyword(s):  
Electric Fields ◽  
High Energy ◽  
Acceleration Process ◽  
Plasma Parameters ◽  
Particle Beams ◽  
Particle In Cell ◽  
Precise Control ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield ◽  
Good Agreement

AbstractPlasma-wakefield accelerators driven by intense particle beams promise to significantly reduce the size of future high-energy facilities. Such applications require particle beams with a well-controlled energy spectrum, which necessitates detailed tailoring of the plasma wakefield. Precise measurements of the effective wakefield structure are therefore essential for optimising the acceleration process. Here we propose and demonstrate such a measurement technique that enables femtosecond-level (15 fs) sampling of longitudinal electric fields of order gigavolts-per-meter (0.8 GV m−1). This method—based on energy collimation of the incoming bunch—made it possible to investigate the effect of beam and plasma parameters on the beam-loaded longitudinally integrated plasma wakefield, showing good agreement with particle-in-cell simulations. These results open the door to high-quality operation of future plasma accelerators through precise control of the acceleration process.

scholarly journals Experiments with laser-irradiated cylindrical targets

1991 ◽  
Vol 9 (3) ◽  
pp. 725-747 ◽  
Author(s):  
C. Stöckl ◽  
G. D. Tsakiris
Keyword(s):  
Light Propagation ◽  
Energy Transport ◽  
Laser Light ◽  
Laser Energy ◽  
Axial Direction ◽  
Radiative Energy ◽  
Capillary Length ◽  
Inner Diameter ◽  
Laser Heated ◽  
Good Agreement

Results of novel experiments with laser-heated capillary targets are presented. In these experiments the interior of gold capillaries having a 200- or 700-μm inner diameter and a 2–12-mm length was axially irradiated by injection of the laser energy through one of the end openings. A frequency-doubled Nd:glass laser (λ = 0.53 μm) was employed, delivering 8-J energy in 3 ns. The experiments showed no significant backreflection of laser light. Depending on the capillary diameter and length, most of the laser energy is either transmitted or absorbed inside the capillary. The transmission of laser light was measured as a function of capillary length and found to be in good agreement with the predictions of a simple theoretical model. Two extreme cases could be identified. Capillaries with a 700-μm diameter show uninhibited laser light propagation due to multireflections off the inner wall. In contrast, at the entrance of capillaries with a 200-μm inner diameter a plasma plug forms that absorbs most of the laser energy. In both cases significant energy transport was observed to occur in the axial direction. A stable and strongly radiating plasma column is formed along the capillary axis by the collision of the radially imploding plasma. During the collision, part of the hydrodynamic energy of the plasma is converted into radiative energy. In a special case-a lower limit of ≊7% could be inferred for the conversion efficiency from laser light into X-ray radiation emitted from the rear opening of the capillary.

scholarly journals Development of a 1 TW/35 fs Ti:sapphire Laser Amplifier and Generation of Intense THz Waves Using Two-Color Laser Filamentation

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 316
Author(s):  
Vanessa Ling Jen Phung ◽  
Keekon Kang ◽  
Seongjin Jeon ◽  
Jinju Kim ◽  
Kyungmin Roh ◽  
...  
Keyword(s):  
Laser Energy ◽  
Second Harmonic ◽  
Laser Pulses ◽  
Intense Laser ◽  
Laser Amplifier ◽  
Terahertz Waves ◽  
Regenerative Amplifier ◽  
Central Wavelength ◽  
Particle In Cell ◽  
Ti:Sapphire Laser

We developed a compact Ti:sapphire laser amplifier system in our laboratory, generating intense laser pulses with a peak power of >1 TW (terawatt), a pulse duration of 34 fs (femtosecond), a central wavelength of 800 nm, and a repetition rate of 10 Hz. The laser amplifier system consists of a mode-locked Ti:sapphire oscillator, a regenerative amplifier, and a single-side-pumped 4-pass amplifier. The chirped-pulse amplification (CPA)-based laser amplifier was found to provide an energy of 49.6 mJ after compression by gratings in air, where the pumping fluence of 1.88 J/cm2 was used. The amplified spontaneous emission (ASE) level was measured to be lower than 10−7, and ps-prepulses were in 10−4 or lower level. The developed laser amplifier system was used for the generation of intense THz (terahertz) waves by focusing the original (800 nm) and second harmonic (400 nm) laser pulses in air. The THz pulse energy was shown to be saturated in the high laser energy regime, and this phenomenon was confirmed by fully electromagnetic, relativistic, and self-consistent particle-in-cell (PIC) simulations.

Laser Assisted E-Beam Epitaxial Growth of Si/Ge Alloys on Si

1990 ◽  
Vol 202 ◽  
Author(s):  
Paul Martin Smith ◽  
S. Lombardo ◽  
M.J. Uttormark ◽  
Stephen J. Cook ◽  
Michael O. Thompson
Keyword(s):  
Film Thickness ◽  
Epitaxial Growth ◽  
Room Temperature ◽  
Laser Energy ◽  
Incident Laser ◽  
Fine Grained ◽  
Surface Mobility ◽  
Incident Laser Energy ◽  
Enhanced Surface ◽  
Xecl Excimer Laser

ABSTRACTA novel laser-assisted technique for e-beam epitaxial growth of GexSi1−x alloys on <100> Si has been investigated. During deposition, a XeCl excimer laser is used to either heat, or to melt and crystallize, the GexSi1−x continuously as the material is evaporated. This process of heating or melting and crystallizing can be continued until the desired film thickness is achieved. At incident laser energy densities which produce melt, the underlying crystalline seed ensures epitaxial growth during the subsequent solidification. Depositions of films up to 3 at.% Ge under this liquid regime, with substrates held nominally at room temperature, exhibited complete epitaxial growth. At energy densities below the melt threshold, enhanced surface mobility for epitaxial alignment is required. Depositions in this regime exhibit only partial epitaxial growth with conversion to fine grained polycrystalline growth after short distances.

The effect of incident laser energy on pulsed laser deposition of HgCdTe films

2009 ◽  
Vol 311 (4) ◽  
pp. 1087-1090 ◽  
Author(s):  
Mei Liu ◽  
Baoyuan Man ◽  
Xingchao Lin ◽  
Xiangyang Li
Keyword(s):  
Pulsed Laser Deposition ◽  
Laser Energy ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Incident Laser ◽  
Incident Laser Energy

Raman Spectroscopy on Individual Identified Carbon Nanotubes

2012 ◽  
Vol 1407 ◽  
Author(s):  
R. Parret ◽  
D. Levshov ◽  
T. X. Than ◽  
D. Nakabayashi ◽  
T. Michel ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Energy ◽  
Low Frequency ◽  
Radial Breathing Mode ◽  
Incident Laser ◽  
Mechanical Coupling ◽  
Incident Laser Energy ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

ABSTRACTIn this paper, we discuss the low-frequency range of the Raman spectrum of individual suspended index-identified single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs). In SWCNTs, the role of environment on the radial breathing mode (RBM) frequency is discussed. We show that the interaction between the surrounding air and the nanotube does not induce a RBM upshift. In several DWCNTs, we evidence that the low-frequency modes cannot be connected to the RBM of each related layer. We discuss this result in terms of mechanical coupling between the layers which results in collective radial breathing-like modes. The mechanical coupling qualitatively explains the observation of Raman lines of radial breathing-like modes, whenever only one of the layers is in resonance with the incident laser energy.

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